Take the 2-minute tour ×
Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. It's 100% free, no registration required.

The Arduino boards provide an analog input range of 0V to 5V which translates to 0 to 1023 integer values. The range is determined by the on-board ADC, which in the case of the Uno is a 10 bit ADC (2^10 = 1024).

Do any of the official boards have a larger (>10 bits) ADC? Do any boards provide a wider range of analog input values?

share|improve this question
    
why do you need more bits of resolution specifically? –  Jarrod Roberson Mar 24 '14 at 17:36

3 Answers 3

AVR-based Arduinos only have 10-bit ADCs, but the ATSAM3X in the Due has 12-bit ADCs. Additionally, it is possible to interface to higher-resolution external ADCs via I2C or SPI.

share|improve this answer
1  
Remember that more bits imply higher sensitivity to power supply various other sources of noise. –  jippie Mar 22 '14 at 17:05
    
Could you please provide some references of external ADC chips that connect through I2C or SPI? –  jfpoilpret Mar 22 '14 at 17:47
1  
    
@jippie, remember that multi-sampling is always available for ADC chips that don't lock in their value... –  Michael Goldshteyn Aug 16 at 1:46

How much accuracy do you really need? If it's just 1 or 2 extra bits of resolution you are after, you might be able to achieve that with a bit of oversampling.

Basically, you take a ton of readings and average them. It only works if there is at least a few mV of random noise in your signal or in your ADC, and if your input signal bandwidth is low enough to be averaging samples together.

Otherwise, go with a dedicated ADC chip.

share|improve this answer

They all do with oversampling. You can evaluate the quality of doing this for your own use.

share|improve this answer
    
Welcome to Arduino SE! Can you please add to your post to explain how you do this? Thanks! –  Annonomus Penguin Aug 14 at 21:11

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.